package org.smart4j.framework.proxy;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import net.sf.cglib.proxy.MethodProxy;

/**
 * description: 代理链
 * @version v1.0
 * @author w
 * @date 2018年9月26日下午9:01:51
 */
public class ProxyChain {
	
	/**
	 * 目标类
	 */
	private final Class<?> targetClass ;
	/**
	 * 目标对象
	 */
	private final Object targetObject;
	/**
	 * 目标方法
	 */
	private final Method targetMethod;
	/**
	 * 方法代理
	 */
	private final MethodProxy methodProxy;
	/**
	 * 方法参数
	 */
	private final Object[] methodParams;
	
	/**
	 * 代理列表
	 */
	private List<Proxy> proxyList = new ArrayList<>();
	/**
	 * 代理索引
	 */
	private int proxyIndex = 0 ;

	public ProxyChain(Class<?> targetClass, Object targetObject, Method targetMethod, MethodProxy methodProxy,
			Object[] methodParams, List<Proxy> proxyList) {
		super();
		this.targetClass = targetClass;
		this.targetObject = targetObject;
		this.targetMethod = targetMethod;
		this.methodProxy = methodProxy;
		this.methodParams = methodParams;
		this.proxyList = proxyList;
	}

	public Class<?> getTargetClass() {
		return targetClass;
	}

	public Method getTargetMethod() {
		return targetMethod;
	}

	public Object[] getMethodParams() {
		return methodParams;
	}
	
	
	public Object doProxyChain() throws Throwable{
		Object methodResult ; 
		if(proxyIndex < proxyList.size()){
			methodResult = proxyList.get(proxyIndex++).doProxy(this);
		}else{
			// 使用 CGLIB 生成代理
			methodResult = methodProxy.invokeSuper(targetObject, methodParams);
		}
		return methodResult;
	}
	
}
